apologies for the delay in responding. the shrub is Criniodendron hookerianum (Elaeocarpaceae). The developing flower buds are very distinctive indeed. Its from Chile and is reasonably hardy but does get caught by frosts as the young foliage and developing flowers are forming at the coldest part of the year. It prefers an acid soil and a reasonably humid environment - mine suffers most through getting too dry in summer.

There is a rather pretty pale pink flowered form in cultivation too called "Adele Hoffman" (if I remember rightly)